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#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <lua.h>
#include <lauxlib.h>
#include "util/util.h"
#define GL_DRAWING_FUNCTIONS \
X("ClearColor", glClearColor_bind) \
X("Clear", glClear_bind) \
X("DrawArrays", glDrawArrays_bind) \
X("DrawElements", glDrawElements_bind) \
X("Viewport", glViewport_bind) \
X("GenFramebuffers", glGenFramebuffers_bind) \
X("BindFramebuffer", glBindFramebuffer_bind) \
X("FramebufferTexture2D", glFramebufferTexture2D_bind) \
X("CullFace", glCullFace_bind) \
X("BlendFunc", glBlendFunc_bind) \
#define X(name, func) int func(lua_State *L);
GL_DRAWING_FUNCTIONS
#undef X
void setup_drawing(lua_State *L, int gl_index)
{
struct honey_tbl_t tbl[] = {
/* functions */
#define X(name, func) H_FUNC(name, func),
GL_DRAWING_FUNCTIONS
#undef X
/******** enums ********/
/* rendering primitives */
H_INT("POINTS", GL_POINTS),
H_INT("LINES", GL_LINES),
H_INT("TRIANGLES", GL_TRIANGLES),
/* clear bitmasks */
H_INT("COLOR_BUFFER_BIT", GL_COLOR_BUFFER_BIT),
H_INT("DEPTH_BUFFER_BIT", GL_DEPTH_BUFFER_BIT),
H_INT("STENCIL_BUFFER_BIT", GL_STENCIL_BUFFER_BIT),
H_INT("FRONT", GL_FRONT),
H_INT("BACK", GL_BACK),
H_INT("FRONT_AND_BACK", GL_FRONT_AND_BACK),
/* BlendFunc factors */
H_INT("ZERO", GL_ZERO),
H_INT("ONE", GL_ONE),
H_INT("SRC_COLOR", GL_SRC_COLOR),
H_INT("ONE_MINUS_SRC_COLOR", GL_ONE_MINUS_SRC_COLOR),
H_INT("DST_COLOR", GL_DST_COLOR),
H_INT("ONE_MINUS_DST_COLOR", GL_ONE_MINUS_DST_COLOR),
H_INT("SRC_ALPHA", GL_SRC_ALPHA),
H_INT("ONE_MINUS_SRC_ALPHA", GL_ONE_MINUS_SRC_ALPHA),
H_INT("DST_ALPHA", GL_DST_ALPHA),
H_INT("ONE_MINUS_DST_ALPHA", GL_ONE_MINUS_DST_ALPHA),
H_INT("CONSTANT_COLOR", GL_CONSTANT_COLOR),
H_INT("ONE_MINUS_CONSTANT_COLOR", GL_ONE_MINUS_CONSTANT_COLOR),
H_INT("CONSTANT_ALPHA", GL_CONSTANT_ALPHA),
H_INT("ONE_MINUS_CONSTANT_ALPHA", GL_ONE_MINUS_CONSTANT_ALPHA),
H_INT("FRAMEBUFFER", GL_FRAMEBUFFER),
H_END
};
create_table(L, tbl);
append_table(L, gl_index, lua_gettop(L));
lua_pop(L, 1);
}
int glClearColor_bind(lua_State *L)
{
lua_Number r, g, b, a;
r = luaL_checknumber(L, 1);
g = luaL_checknumber(L, 2);
b = luaL_checknumber(L, 3);
a = luaL_checknumber(L, 4);
glClearColor(r, g, b, a);
return 0;
}
int glClear_bind(lua_State *L)
{
lua_Integer mask = luaL_checkinteger(L, 1);
glClear(mask);
return 0;
}
int glDrawArrays_bind(lua_State *L)
{
lua_Integer mode, first, count;
mode = luaL_checkinteger(L, 1);
first = luaL_checkinteger(L, 2);
count = luaL_checkinteger(L, 3);
glDrawArrays(mode, first, count);
return 0;
}
int glDrawElements_bind(lua_State *L)
{
lua_Integer mode, count, type, offset;
mode = luaL_checkinteger(L, 1);
count = luaL_checkinteger(L, 2);
type = luaL_checkinteger(L, 3);
offset = luaL_checkinteger(L, 4);
glDrawElements(mode, count, type, (const void*)offset);
return 0;
}
int glViewport_bind(lua_State *L)
{
lua_Integer x, y, w, h;
x = luaL_checkinteger(L, 1);
y = luaL_checkinteger(L, 2);
w = luaL_checkinteger(L, 3);
h = luaL_checkinteger(L, 4);
glViewport(x, y, w, h);
return 0;
}
int glGenFramebuffers_bind(lua_State *L)
{
int framebuffer;
glGenFramebuffers(1, &framebuffer);
lua_pushinteger(L, framebuffer);
return 1;
}
int glBindFramebuffer_bind(lua_State *L)
{
int target = luaL_checkinteger(L, 1);
int framebuffer = luaL_checkinteger(L, 2);
glBindFramebuffer(target, framebuffer);
return 0;
}
int glFramebufferTexture2D_bind(lua_State *L)
{
int target = luaL_checkinteger(L, 1);
int attachment = luaL_checkinteger(L, 2);
int textarget = luaL_checkinteger(L, 3);
int texture = luaL_checkinteger(L, 4);
int level = luaL_checkinteger(L, 5);
glFramebufferTexture2D(target, attachment, textarget, texture, level);
return 0;
}
int glCullFace_bind(lua_State *L)
{
int mode = luaL_checkinteger(L, 1);
glCullFace(mode);
return 0;
}
int glBlendFunc_bind(lua_State *L)
{
int sfactor = luaL_checkinteger(L, 1);
int dfactor = luaL_checkinteger(L, 1);
glBlendFunc(sfactor, dfactor);
return 0;
}
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